diff --git a/img/Makefile b/img/Makefile
index 0beb3a0..e21c010 100644
--- a/img/Makefile
+++ b/img/Makefile
@@ -1,5 +1,5 @@
 
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-%.png : %.fig
-	fig2dev -L pdf $^ | pdftoppm | pnmtopng > $@
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diff --git a/img/coordinates.fig b/img/coordinates.fig
deleted file mode 100644
index 8675278..0000000
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diff --git a/img/coordinates.png b/img/coordinates.png
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new file mode 100644
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+       points="2425 1425 2409 1362 2393 1425 2425 1425  "
+       style="stroke:#000000;stroke-width:4;stroke-miterlimit:8; fill:#000000;"
+       id="polygon96" />
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="1370"
+       y="1228"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="152"
+       text-anchor="middle"
+       id="text98">(0,0)</text>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="1322"
+       y="1937"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="152"
+       text-anchor="end"
+       id="text100">(0, rows - 1)</text>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="1370"
+       y="3826"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="152"
+       text-anchor="middle"
+       id="text102">(0, rows * parallel - 1)</text>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="4677"
+       y="1181"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="152"
+       text-anchor="middle"
+       id="text104">(32 * chain,0)</text>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="4771"
+       y="3826"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="152"
+       text-anchor="middle"
+       id="text106">(32 * chain - 1, rows * parallel - 1)</text>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="2692"
+       y="1133"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="152"
+       text-anchor="middle"
+       id="text108">chain length</text>
+    <!-- Text -->
+    <g
+       transform="translate(1133,2551) rotate(-90.00021046)"
+       id="g110">
+      <text
+         xml:space="preserve"
+         x="0"
+         y="0"
+         fill="#000000"
+         font-family="Helvetica"
+         font-style="normal"
+         font-weight="normal"
+         font-size="152"
+         text-anchor="middle"
+         id="text112">parallel count</text>
+    </g>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="1700"
+       y="1511"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="126"
+       text-anchor="middle"
+       id="text114">32 pixel</text>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="2503"
+       y="1606"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="126"
+       text-anchor="start"
+       id="text116">rows</text>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="2503"
+       y="1811"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="normal"
+       font-size="76"
+       text-anchor="start"
+       id="text118">(16 or 32)</text>
+    <!-- Text -->
+    <text
+       xml:space="preserve"
+       x="5763"
+       y="3070"
+       fill="#000000"
+       font-family="Helvetica"
+       font-style="normal"
+       font-weight="bold"
+       font-size="152"
+       text-anchor="start"
+       id="text120">Pi</text>
+  </g>
+</svg>